Four sisters are 30 months apart in age.
If the sum of there ages is 31 years, how old is the youngest sister?
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Answer:
the youngest sister is 4 years old
Step-by-step explanation:
30 month = 2.5 year
let the age of 4 sisters be x, x+2.5 , x+5, and x+7.5.
according to question
x + x+2.5 + x+5 + x+7.5 = 31
=> 4x + 15 = 31
=> 4x = 16
=> x = 4 yr
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